<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>数据统计</el-breadcrumb-item>
      <el-breadcrumb-item>数据报表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片试图区域 -->
    <el-card class="box-card">
      <div id="main" style="width: 800px;height: 400px;"></div>
    </el-card>

  </div>
</template>

<script>
//1、导入echarts
// import echarts from  'echarts'
import * as echarts from 'echarts';

import _ from 'lodash'
export default {
  data(){
    return{
      options: {
        title: {
          text: '用户来源'
        },
        tooltip: {
          trigger: 'axis',
          axisPointer: {
            type: 'cross',
            label: {
              backgroundColor: '#E9EEF3'
            }
          }
        },
        grid: {
          left: '3%',
          right: '8%',
          bottom: '3%',
          top:  '20%',
          containLabel: true
        },
        xAxis: [
          {
            name: '时间',
            boundaryGap: false
          }
        ],
        yAxis: [
          {
            name: '用户数量',
            type: 'value'
          }
        ]
      }
    }
  },
  created () {
  },

  //页面上的元素已经被渲染
  async mounted () {
    // 2基于准备好的dom，初始化echarts实例
    var myChart = echarts.init(document.getElementById('main'));

    //3、准备数据和配置项
    const { data:res } = await this.$http.get('reports/type/1')

    if (res.meta.status!==200){
      return this.$message.error('获取折线图失败')
    }

    const result = _.merge(res.data,this.options)

    // 4使用刚指定的配置项和数据显示图表。
    myChart.setOption(result);


  }
}
</script>

<style scoped>

</style>
